Periodicity in recurrent fast radio bursts and the origin of ultralong period magnetars

  title={Periodicity in recurrent fast radio bursts and the origin of ultralong period magnetars},
  author={Paz Beniamini and Zorawar Wadiasingh and Brian D. Metzger},
  journal={Monthly Notices of the Royal Astronomical Society},
The recurrent fast radio burst FRB 180916 was recently shown to exhibit a 16-d period (with possible aliasing) in its bursting activity. Given magnetars as widely considered FRB sources, this period has been attributed to precession of the magnetar spin axis or the orbit of a binary companion. Here, we make the simpler connection to a rotational period, an idea observationally motivated by the 6.7-h period of the Galactic magnetar candidate, 1E 161348–5055. We explore three physical… 

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